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Junk food is much more dangerous than genetically modified foods, says Dr John Pidgeon from Broom's Barn research centre in the UK, as he examines the evidence for GM food safety and for genetic contamination of wild crops with Professor Bruce Tabashnik of Arizona University, USA. Tracing farm animals' origins through their DNA. How the common bacterium Helicobacter pylori hijacks a body's defence system and causes ulcers. Exploring the planet Venus for signs of life.